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If the computer radiator uses pure copper: 1, too expensive, it hurts to buy; 2, too heavy, worry that the motherboard will not stand; 3, how the effect is not improved, become a big head; 4, used for a while, pure copper The surface is oxidized, once the beauty is now rotten into slag. Others do not say (weight, cost, maintenance, etc.), 咱 only talk about heat dissipation, some physical properties of pure copper and pure aluminum A simple comparison:
Everyone thinks that the thermal conductivity of copper is strong, because copper's thermal conductivity is much higher than that of aluminum (here, pure copper and pure aluminum). This is indeed, it has been learned in middle school. But a radiator heat dissipation capability. The quality is not only related to the thermal conductivity of the material, but also related to the heat dissipation area, the shape of the radiator, the air flow and so on.
Look at the last two parameters, you can see the number of specific heat capacity, you will definitely say, wow, the specific heat capacity of copper is smaller, its temperature rises faster, it is not easier to dissipate heat (the laws of thermodynamics, the higher the temperature gradient, the heat transfer) The sooner it seems, it's right, but... you have to look at their density.
The density of copper is 3.3 times that of aluminum. The radiator is a size-sized product. It can't be made infinitely large. Under the same size, is the heat capacity of copper small or the heat capacity of aluminum? It can be calculated simply.
Assuming that it is a cubic centimeter of material, the weight of copper is 8.9 grams, let it rise 1K, it needs 3.4KJ of heat, the weight of aluminum is 2.7 grams, let it rise 1K, the required heat is 2.4KJ, That is to say, under the unit volume, the heat capacity of aluminum is only 70% of copper, and its heat dissipation is faster.
Therefore, although the thermal conductivity of copper is higher than that of aluminum, the heat transfer resistance from the CPU to the environment is small, but its heat capacity is larger under the same volume, the temperature rises slowly, so the temperature gradient is small, and the heat transfer capacity is combined. Not necessarily much better than aluminum.
In thermodynamics, the heat transfer rate equation is Q = KAΔt, where Q is the heat transferred, K is the thermal conductivity of the material, A is the heat transfer area, and Δt is the temperature difference. Under the same volume, assuming A is the same, Q It is mainly determined by the difference between the thermal conductivity of the material and the heat transfer medium. The heat dissipation of the CPU is actually two processes, one is from the CPU to the heat sink, and the other is from the heat sink to the environment (air).
For a pure copper heat sink, the heat is from the CPU to the heat sink. Because K is larger, Δt is also larger (the temperature difference between the heat sink and the CPU, because the copper temperature rises slowly under the same volume), the heat transfer rate in this process is obvious. Better than a pure aluminum radiator, but in the second stage, when heat is transferred from the radiator to the air, K is the same (both air), Δt is a pure copper radiator is smaller (here is the radiator and air Temperature difference), in this process, the efficiency of the pure copper radiator is lower than that of the aluminum radiator. There has been a saying that copper absorption is fast, aluminum heat is fast, it makes sense.
Pure copper radiators have not been seen. We have tested the pure copper Ultra 120E in the early years. It weighs 1.89kg, while the ordinary Ultra 120E radiator is only 785g, which weighs 1.1kg. But what about the performance? :
Under such a high cost and large weight, the performance gain of the pure copper radiator is actually very low, and it is only 4 degrees lower than the ordinary U120E. Of course, if you pursue the ultimate, it is not bad, just The price is too big.
In general, pure copper radiators are not cost-effective, the cost is too high, the processing is more difficult, the cost performance is low, and the eyeballs are still acceptable. It must not be mainstream, and the aluminum radiator has been singing the protagonist for so many years. The result of correct selection, such as its low cost, low density, easy processing and hardness, is also very important. The heat sink made by it is very close to pure copper in heat dissipation. Therefore, why should we use pure copper to dissipate heat? What about it?!
